Though the Marvel Cinematic Universe introduced Kang as its chief villain for the next group of its films, they appear to be moving away from that plan. This could have any number of causes. First and foremost, the films featuring him have not performed as well at the box office as previous entries. Ant-Man and the Wasp: Quantumania, which had Kang as the primary villain, was panned as one of the worst entries to the franchise so far. Clearly, something about him isn't working. On top of that, Jonathan Majors, the actor behind the character, has allegations leveled against him by his former partner, which may encourage Marvel to either recast him or find alternate options for the antagonist of the Multiverse Saga. This development will require a massive restructuring of the next batch of movies, as they're all going to have to be rebuilt around whichever new character they select to oppose the heroes.
Source：https://www.cbr.com/young-avengers-iron-lad-mcu-kang-problem/
